Why Time Travel is Impossible

Suppose your future self travels back in time, in view of the changes caused by time travel, you can then still decide not to travel back in time after all, so that the appearance of your future self would suddenly be without cause. Time travel creates a situation in which causality is optional. Only when cause precedes effect is it required to happen for the effect to happen. This proves that time travel is impossible. There is no time, only an ever self-transforming moment.